Forward and reverse paper feed means in selective printing machines



April 5, 1966 M. P. MATTHEW 3,244,095

FORWARD AND REVERSE PAPER FEED MEANS IN SELECTIVE PRINTING MACHINES April 5, 1966 M. P. MATTHEW 3,244,095

FORWARD AND REVERSE PAPER FEED MEANS INl SELECTIVE PRINTING MACHINES Filed Deo. 4, 1963 5 Sheets-Sheet 2 IN VENTOR. Mayra/v P. /Mfr/vfh/ BY La m Aprll 5, 1966 M. P. MATTHEW 3,244,095

FORWARD AND REVERSE PAPER FEED MEANS IN'v V SELECTIVE PRINTING MACHINES v Filed Deo. 4, 1963 3 Sheets-Sheet 5 INVENTOR. afro/v /Mfrf/fh/ United States Patent O 3,244,095 FORWARD AND REVERSE PAPER FEED MEANS IN SELECTIVE PRINTING MACHINES Morton P. Matthew, Norwalk, Conn., assigner to The Bunker-Ramo Corporation, a corporation of Delaware Filed Dec. 4, 1963, Ser. No. 328,037 11 Claims. (Cl. 101-94) The present invention relates to a printer and more particularly to an improved paper feed mechanism for successively feeding a sheet to be printed toward and away from a printing station and advancing the sheet a distance of one printed line at the end of each printing cycle.

While the improved pape feed and gainer mechanism of the present invention may have other applications, it is particularly adapted for and shown applied to a printer of the typeillustrated and described in an application for United States Letters Patent of Richard H. Podoloff et al. Serial No. 153,627, iiled November 20, 1961, and entitled Printer for Data Processing Apparatus, now U.S. Patent N-o. 3,146,701. The printer illustrated and described in said application comprises a continuous paper web looped around a pivotally mounted cylindrical platen for movement toward type elements at a printing station to print on the web, It is necessary, therefore, to move the paper from an observation station where the printing can be observed to a printing station under the platen Where printing Occurs; and then return the web from the printing station back to the observation station after a printing operation. In addition, the paper web must be advanced one line of printing after each printing operation.

The mechanism illustrated and described in said patent application for controlling the paper feed utilizes gear and ratchet wheels on the platen and a reciprocating rack and pawl. The rack lies on the gear wheel and when the rack is reciprocated the gear wheel and platen are rotated in alternate directions t-o move the paper web, Adjacent the end of the forward stroke of the rack, the pawl engages the ratchet wheel and lifts the rack from engagement with the gear wheel but continues to rotate the platen during its forward movement. However, during the rearward stroke neither the rack nor ratchet moves the platen until the rack is again lowered into engagement with the gear wheel. Thus, the paper feed advances the paper web a distance greater than it is withdrawn and the differenceis made equal to the distance of one line of printing to provide a gain in the paper fee-ding mechanism. While the paper feed and gai-ner mechanism described and claimed in the Podoloif et al. application works quite satisfactorily in performing its intended function, it constitutes a complicated mechanical arrangement having a substantial number of parts; and the parts are not positively connected to insure reliable operation of all operation conditions.

One of the objects of the present invention is to provide an improved paper feed and gainer mechanism which positively controls the movement of the paper web by pulling the opposite ends of the loop of paper extending around a freely rotatable platen.

Another object is to provide an improved paper feed and gainer mechanism for a printer which converts the movement of an oscillating driving element having the same angular movement in opposite directions to oscill'ate a driven element and take-up reel through different degrees of angular movement in opposite directions.

Still Aanother object of the present invention is to provide an improved paper feed and gainer mechanism for a printer which is of relatively simple and compact construction, economical to manufacture and one which is ice reliable in operation to positively reciprocate thepaper web to and from a printing station as well as advance the web through a distance of one printed line after each printing operation.

These and other objects will become more apparent from the following description and drawings in which like reference characters denote like parts throughout the several views. It is to be expressly understood, however, that the drawings are for the purpose of illustration only and are not a definition of the limits of the invention, reference being had for this purpose to the appended claims.

In the drawings:

FIGURE l is a side elevational view of a printer shown partly in section to illustrated the relationship of the parts of the paper feed and gainer mechanism prior to a printing operation; i

FIGURE 2 is a schematic view illustrating the paper Web and driving means therefor and showing the relationship of the parts when the paper web has been moved to a printing position;

FIGURE 3 is an extended perspective view of the parts of the gainer mechanism for driving the take-up reel and showing the concentrically mounted pair of oneway clutches operated by an eccentrically mounted oscillating swingeplate;

FIGURE 4 is a front view of the paper feed andV gainer mechanism;

FIGURE 5 is a side view of the one-way clutch for controlling the movement of the take-up reel counterclockwise;

FIGURE 6 is a view similar to FIGURE 5 showing the other one-way clutch for driving the take-up reel clockwise;

FIGURE 7 is a side view of the swing-plate and shaft for the take-up reel and showing the unequal angular movement of the shaft and take-up` reel when driven from the eccentrically mounted swing-plate;

FIGURE 8 is a perspective view of the spring operated paper gripping and releasing mechanism for moving the paper from the observation station to the printing station and showing how the paper is gripped between the pivoted bails; and

FIGURE 9 is a side elevational view of the spring actuated paper gripping and releasing mechanism and showing one of the hails engaging la stop to rock the bails relative to each other to release the paper.

As stated above, the paper feed and gainer mechanism of the present invention is shown applied to a printer of the type illustrated and described in the application for United States Letters `Patent of Richard H. Podoloff et al. Serial No. 153,627 for purposes of illustration. vSuftice it to state herein that the printer illustrated is particularly adapted for use in banks to print the same digital information on a bank book (not shown) and arecord tape Tp. The bank book is mounted on a sliding car-` riage 10 for movement to a printing station where it overlies an anvil 11 at the end of a pivoted frame 12 ,constituting a press. Record tap Tp is looped around a cylindrical platen 13 at the printing station and the platen is mounted on a pivoted frame 14 and Vconstitutes a press. Positioned between the anvil 11 and platen 13 are a plurality of type bars 15 arranged in side by side relationship and movable relative to each other. Each type bar 15 has the same type faces 16 and 16a at the top and bottom edges corresponding to the characters to be printed such as, for example, the numerals l to 9 and 0. Each type bar 15 is moved to an adjusted position relative to the other bars by a spur gear 17 for meshing engagement with rack teeth 19 on the type bar and each spur gear 17 is mounted on a pivoted frame 18. The' spur gears 17 are normally engaged with the rack teeth 19 on the respective type bars 15 and the plurality of spur gears are rotated to adjust the type bars and position the desired type faces 16 and 16a at the printing station. A control mechanism, including an electromagnet for each frame 18, rocks its frame to disengage its spur gear 17 from the rack teeth 19 of its bar when the desired type face is at the printing station.

' After the type bars 15 have been adjusted relative to each other the pivotal frame 12 mounting the anvil 11 is rocked toward the print bars to print the information on, for example, a bank book at the printing station; and the platen 13 is rocked toward the opposite side of the print bars to print the same information on the record tape Tp.

The driving mechanism for the printer comprises an electric motor 22 which operates through a belt 23 and counter-shafts 24 and 25 to drive a selection shaft 26 connected to drive the spur gears 17 for adjusting the type bars and a print shaft 27 for printing on the bank book and record tape, respectively. The selection shaft 26 and print shaft 27 are operated alternately in succession so that the type bars 15 will be first adjusted relative to each other and after which a printing operation takes place. The driving mechanism also includes a shaft 28 for performing :other functions in the printer. The pivoted frame 12 mounting the anvil 11 is rocked toward the type bars 15 by a cam 29 on the print shaft 27 which operates through a cam follower 39 on a link 31 interposed between the cam 29 and frame. Selecting mechanism 34 on the shaft 23 controls the link 31 to position it between the print shaft 27 and frame 12 or withdraw it therefrom to control printing on the bank book. The pivoted frame 14 mounting the platen 13 has links 33 depending therefrom which are operated by eccentrics 32 on the print shaft for moving the platen and record tape Tp toward the type bars 15 to print on the tape.

In accordance with the present invention an improved paper feed and gainer mechanism 35 is provided for moving the record tape Tp from an observation station S1 at the top of platen 14 to a printing station S2 under the platen and then return the tape from the printing station to the observation station. During the return of the tape from vthe printing to the observation stations the paper feed and gainer mechanism 35 advances the tape a distance of one printed line.

In general, the record tape Tp is in the form of a continuous web with a loop'of the web between a supply roll 36 and take-up reel 37, see FIGURES 1 and 2, extending forwardly over guide rolls 38 and 39, around the platen 13 and then over guide roll 40 as it leads to the take-up reel. The take-up reel 37 and a pivoted paper gripper 41 engage the web of record tape Tp at the topposite ends of the loop and pull it in opposite directions around the platen 13. The tape Tp is moved from the observation station S1 illustrated in FIGURE 1 to the printing station S2 illustrated in FIGURE 2, by the pivoted gripping device 41 which is rocked by a spring 42 to pull the end of the loop a distance equal to the distance from the observation station to the printing station a blank section of the tape adjacent the last printed line at the printing station. Such movement of the tape Tp is controlled -by the driving means for the take-up reel 37 which perimts it to rotate counterclockwise. The take-up reel 3 7is positively driven clockwise to pull the web at the opposite end of the loop and move the newly printed line from the printing station S2 to the observation station S1. The positive drive of the take-up reel 37 acting through said web pulls on the pivoted gripping device 41 and rocks it against the action of spring 42 from the position illustrated in FIGURE 2 to that illustrated in FIGURE 1. Such rocking movement continues until a length of web Tp corresponding to the distance between the printing station S2 and observation station S1 has moved over the platen 1,3 after which the gripping device 41 releases the web to permit an additional length of web to feed from the supply roll 36 into the loop. T he last printed line on the record tape Tp is located at the observation station at the beginning of a printing operation and the first movement of the driving mechanism for adjusting the type bars 15 operates the take-up reel 3'7 from the position illustrated in FIGURE 1 to that illustrated in FIGURE 2. After a printing operation has been performed .the take-up reel 37 is moved back to its initial position plus one printed line from that illustrated in FIGURE 2 to that illustrated in FIGURE 1.

Take-up reel 37 is driven by an oscillating swing plate 43 and the swing plate is oscillated by a link bar 44 pivotally connected thereto at :one end and connected to a lever 45 at its opposite end. Lever 45 is mounted to rock on a pivot 46 and has a cam follower 47 engaging a cam 4S on the selection shaft 26. The opposite end of the lever 45 has a pin 49 projetcing into a slot 50) in the lower end tof the link bar 44. A spring 51 acts on the lever 45 to rock it clockwise as viewed in FIG- URE l to hold the link bar 44 down and thereby rock the swing plate 43 to the position illustrated in FIG- URE l. Upon rotation of the selection shaft 26 to adjust the type bars 15, the lever 45 is rocked counterclockwise to release the link bar which is then actuated upwardly by the spring 52 to rock the swing plate to the position illustrated in FGURE 2.

The gainer mechanism 35 converts the equal angular movement of the swing plate 43 in opposite directions to unequal angular movements of the take-up reel 37 in opposite directions. Referring now to FIGURES 3 and 4, the gainer mechanism is shown as comprising a shaft 56 having a hub 57 for ylocking engagement with one end of the take-up reel 37. Swing plate 43 is mounted to rock about an axis X on a cylindrical boss 58 projecting inwardly from the side plate 55 of the machine frame. Shaft 56 is journaled for rotation in side plate 55 of the frame for rotation about an axis Y eccentric to the axis X of the cylindrical boss 5@ and oscillating swing plate 43. In the illustrated embodiment the axis X of plate' 43 is located at the right hand side of the axis Y of the Shaft 56 and take-up reel 37. It will be understood that the cylindrical boss 58 may be mounted on the frame of the machine for turning movement relative to the shaft 56 to vary the lateral eccentricity of the axes of the swing plate 43 and shaft 56.

Mounted on the shaft 56 are a pair of one-way clutches 59 and titl having radial arms 61 and d2, respectively, as shown in FIGURES 3, 5 and 6. The one-way clutches 59 and 6i) may be of any conventional form and in the illustrated embodiment each comprises a cylindrical hub' 53a or 611er with tangential recesses 59b or 60]; and spring loaded rollers 64 or 64a in the recesses for gripping engagernent when turned in one direction and releasing the parts of the clutch when moved in the opposite direction. As shown in FIGURES 3 and 5 the clutch 59 acts as a brake to control the movement of the web Tp and has its inclined recesses 5% and rollers e4 arranged to grip the shaft 56 and clutch hub 59a when the latter rotate counterclockwise relative to arm 61 and release the shaft and hub 59a during clockwise movement relative to arm 61; and the one-way clutch 66 has its angular recesses h and rollers 64a arranged to grip and drive the shaft 56 upon clockwise movement and release the shaft during counterclockwise movement.

As shown most clearly in FIGURE 3 the swing plate 43 is of generally diamond shape having a crank pin 651 projecting from one side parallel to its axis X and pivotally connected to the upper end of the link bar 44. A pair of pins 66 and 67 project from the opposite side of the swingplate 43 adjacent its outer ends and the pins extend intoy slots 68 and 69 in the arms 61 and 62 of the one-way clutches 59 and 6i?, respectively. Thus, when the swing plate 43 is rocked counterclockwise, the motion is transmitted through the pin 66 and slot 68 in the arm 6,1 of;

the one-way clutch '59 to rock the arm and permit the shaft 56 and take-up reel 37 to rotate counterclockwise. 'On the other hand, when the swing plate 43 is rocked clockwise ythe motion is transmitted through the pin 67 and slot 69 to positively rock the clutch 60, shaft 56 and takeiip reel 37 clockwise.

Due to the eccentricity of the axes X and Y of the swing plate 43 and shaft 56, a counterclockwise movement of the swing 4plate through a given angle about its axis X will permit the shaft 56 to rotate through a given angle about its axis Y. Also the clockwise movement of swing Aplate 43 through the same given angle about its axis X will rotate the shaft v56 through a greater angle. This lis illustrated graphically in FIGURE 7 where the eccentricity of the swing plate 43 and shaft 56 is indicated by the distance e. Lines drawn horizontally through the two Aaxes X and Y and through .the axis X of the cylindrical boss 58 and pins 66 and 67 will subtend angles VC which are equal and opposite on opposite sides ofthe axis of the swing plate 43. A line from `the axis Y of the shaft V56 through the pin 66 then subtends an angle B while a line from the axis Y through the pin 67 subtends` an angle A. As will be clearly observed from FIGURE 7, the angle A is greater than the angle C and that the angle B is less than the angle C. Therefore the angle A must be greater than the angle B. Thus, when the swing plate 43 is oscillated'in'opposite directions through angles equal to the angle C the pin 66 will have moved through lan angle B with respect to the axis Y of the shaft 56 while the pin 67 will have moved through a greater angle A with respect to the axis Y. `By adjusting the ecc-entricity e, the shaft 5 6 and take-up reel 37 kas shown in FIGURE 3 can be made 4to move through different angular distances and produce a different linear movement of the paper web Tp corresponding to a distance of one printed line. In other words, by mounting the swing plate 43 on an axis X eccentric to the axis Y of the shaft 56, the `pin 67 moves through va given distance in an arc closer to the axis Y than -does the pin '66 located further away from axis Y `and therefore moves its one-way clutch 60 through a greater -arciwith respect to its axis Y than the pin 66 and its one-way clutch 59. The gainer mechanism thereby produces an unequal angular movement of the shaft 56 from the equal angular 'movement 'of the swing plate 43.

As the paper web Tp is wound on lthe take-up vreel -37 `the diameter of the paper roll increases so :that the sam'e yangular movement of the ytake-'up reel will produce different linear movemen-t of the web. To compensate for this and maintain the Vgain or linear advance of the `paper web Tp constant, an adjustable stop 72 is provided for limiting the angular 'movement of the oscillating swing plate 43. As will be observed by reference `to-FIGURES l and 3, the link bar 44 is moved downwardly by the driving mechanism including the lever 45 which limits the extent of clockwise movement of swing lplate 43. Lever 45 releases the :bar 44 at the beginning of a printing Vo'p'- eration. The link bar 44 is then lmoved upwardly by the spring 52. This upward movement of the link bar'44 and oscillation of the swing plate 43 counterclockwise under the action of the spring 52 `is limited -by the engagement `of the driving pin 66 with the adjustable stop 72. Stop H72, in turn, projects from one side ofa sleeve 73 rotatable on a shaft 74 and the sleeve has an outwardly projecting feeler arm 75 which bears against and feels the increase in diameter of the take-up reel 37. Thus, as the take-up reel 37 increases in diameter, as viewed in FIGURE 3, the sleeve 73 and adjustable stop 72 are rocked clockwise to decrease the counterclockwise swinging movement of the swing plate 43. As the shaft 74 is offset with respect to the axis X of the swing plate 43 a different portion of the adjustable stop 72 will be engaged bythe driving pin 66. In order to attain the same lmovement of vthe paper web Tp for different diameters, the surface edge 76 of vthe adjustable vstop 72 is provided with the 6 proper curvature to produce the same linear advance of the web Tp at different diameters of the take-up reel 37.

The web gripping device 41 is shown in detail in FIG- URES V8 and 9 as comprising a pairvof pivotally connected bails`80 and 8-1. As shown in FIGURE 8, the supply roll 36 of the paper web T-p is mounted on -a shaft A82 journaled in the vside plates 55of the frame. Bail 80 has a crossbar 33 and inwardly directed arms 84 at the ends of the crossbar so diinensionedv that the bail encloses a portion of the 'supply `reel 36. The arms S14-of the bail A80 are pivotal'ly mounted inthe side plates 55 'of the frame Aby means of pins projectingtherethrough. Bail 81 has a 'crossbar l'86 'and right angular arms "87 of a width to 'straddle 'the larms 84 of the bail 80 and the arms "84 and L87 are .pivotally `'coniie'cted to each other by means o'f pins 88. I t will be noted by reference to FIGURE l8 that the crossbar 86 lof the bail 81 is in alignment with and overlies one edge of the crossbarj83 lof the bail 80. Springs 42 act between the pivot pins `$8 'and the sides 55 vof lthefframe to rock 'the bail's clockwise as a unit. The web of record tape Tp extends upwardly and rearwardly over 'the rectangular crossbar 83 of theba'il 80 and then around lthe cylindrical crossbar 86'of'the bail 81 to reverse its direction. 'The tension ofthe 'web on the crossbar 86 of bail v81 roc'ks it toward the crossbar 83 of bail "Slito grip the paper therebetween. Continued pulling of vthe web forwardly 'from fthe 'position illustrated in FIGURE 8 will rock the 'bails l60 and *81 forwardly as Ta unit against the action of the springs 42 as illustrated in FIGURE 1. This counterclockwise rocking movement vof the 'gripping device 41 continues until the extended end of an arm 87 o'fithe bail `81 engages a stop pin 89 projecting inwardly from the side plates v55 'of the frame- Continued counterclockwise rocking movement of the gripping device 41 'then causes the bails to rock relative to each other as the counterclockwise movement of the pivot pins 88 continues, and this relative movement `opens fthe bails and releases the paper web. The arrangement is such that the gripping device 41 permits the advance of a length of the web Tpequal to the `length of web paid off from the 'takeup reel 37 before the Iextension ofthe arm 86 engages 'the' stop pins 89. The 4continued movement of the take-up reel 37 in aclockwise direction `then causes a feeding o'f a length of web corresponding to vone line df printing on the web from the `supply 'roll 36 between the "bails 80 and Slot the gripping device 41 and linto the loop. One form of. the invention having now 'beendesc'ribed in detail the mode of operation is explained as follows.

At the beginning of a cycle 'of Aoperation `of the printer the parts are in the relative position illustrated in FIG- URE l. To initiate a printing operation a bank book 'is mounted on the carriage 10 and moved `to a printing station underlying the ltype bars `15. Upon loperation of a suitable control element the driving mechanism operates through the motor 22, belt 23 and countershafts 24 and 25 to rotate the selection 'shaft 26. Rotation of the selection shaft 26 adjusts the type bars 15 relative to each other to position the desired sequence of the 'type faces between the anvil 11 and platen 13. Simultaneously, the rotation of the selection shaft 26 operates through the cam'48 and lever 45 to release the link bar 44. Link bar 44 is then moved upwardlyfby the spring 52 to rock the swing plate 43 from the position illustrated in FIGURE 1 to that illustrated in FIGURE 2. Referring now to FIG- URE 3, the counterclockwise movement of the swing plate 43 is transmitted through the pin 66 'and one-way clutch 59 to permit the shaft 56 'and take-up reel 37 to rotate counterclockwise to pay out a length of the printed web Tp equal -to the distance from Athe observation station S1 to the printing -station 82. The gripping device 41 which grips the web tape Tp adjacent the supply roll 36 is rocked clockwise by spring 42 from the position illustrated in FIGURE l t0 that illustrated in FIGURE -2 when the -tape is released to draw the loop rearwardly and move an unprinted area "of the tape adjacent the last y'7 printed line to the printing station. This movement of the take-up reel 37 and web of the loop is controlled by the engagement of the drive pin 66 with the adjustable stop 72, see FIGURE 2.

The machine is now ready for a printing operation and a cam 29 on the print shaft 27 operates through the cam follower 30 and link 31 to rock the pivoted frame 14 clockwise and press the bank book between the anvil 11 and type bars 15. Eccentric 32 on the print shaft 27 also rocks the pivoted frame 12 mounting the platen 13 toward the type bars to print the information on the tape Tp.

After the completion of the printing operation the lever is released and actuated by the spring 51 to rock it clockwise as viewed in FIGURE 1. Clockwise rocking movement of the lever 45 acts through its pin 49 to pull the link bar 44 downwardly and thereby rock the swing plate clockwise from the position illustrated in FIGURE 2 back to the position illustrated in FIGURE l. Clockwise rocking movement of the swing plate 43 is transmitted through the pin 67 see FIGURE 3, and oneway clutch 60 to rock the shaft S6 and take-up reel 37 in a clockwise direction. Due to the eccentrieity of the axis X of the swing plate 43 with respect to the axis Y of the shaft 56, the clockwise swinging movement of the swing plate 43 rocks the shaft 56 to wind up the web and move the printed lines from the printing station S2 to the observation station S1. In so doing, shaft 56 is rocked through a greater angular distance than it was moved by the one-way clutch 59 during the unwinding corresponding to one line of printing.

It will now be observed that the present invention provides an improved paper feed and gainer mechanism which positively controls the movement of a record tape as it moves from an observation station to a printing station and return by pulling its opposite ends. It will also be observed that the paper feed and gainer mechanism converts the equal angular movement of an oscillating driving element to unequal angular movements of a takeup reel in opposite directions to advance the web a distance equal to one line of printing after each printing operation. It will still further be observed that the present invention provides an improved paper feed and gainer mechanism `which is of relatively simple and compact construction, economical to manufacture and one which is reliable in operation to positively drive the paper web in opposite directions.

While a single embodiment of the invention is herein illustrated and described, it will be understood that modifications may be made in the construction and arrangement of elements without departing from the spirit or scope of the invention. Therefore, without limitation in this respect, the invention is defined by the following claims.

I claim:

1. In a printer of the type having type elements with a type face for each character to be printed, means for adjusting the plurality of type elements relative to a printing station, a platen roll at the printing station, a web of paper looped around said platen roll, means for mounting the type elements and platen roll for relative movement to print an impression from the type elements onto the web and driving means for the type element adjusting means and for relatively moving the `type elements and platen roll in timed relation, the combination with said elements of said printer of an improved paper feed and gainer mechanism comprising a take-up reel connected to one end of the loop of paper for positively moving it in one direction, a spring actuated take-up means connected to the other end of the loop of paper for moving it in the opposite direction, a drive shaft connected to the take-up reel, a pair of `one-way clutches mounted on said shaft, one of said one-way clutches being mounted to grip and rotate the shaft when turned clockwise and release the shaft when turned counterclockwise, the other of said clutches controlling and limiting the rotation of the shaft when turned oounterclockwise, a member mounted to yoscillate on an axis eccentric to the axis of said drive shaft, and said member having a sliding connection with the one-way clutches to osciliate the clutches whereby to turn said shaft and web of paper through a greater arc in one direction than it is moved in the other direction.

2. In a printer having a cylindrical platen, type elements having a type face for each character to be printed, a web of paper looped around the platen, driving mechanism for moving the paper web from an observation station to a printing station and then back to the `observation station comprising a take-up reel, a shaft connected to drive the take-up reel, clutch means permitting controlled rotation of the take-up reel shaft in `one direction and positively turning the shaft in the opposite direction, an oscillating element mounted to rock -on an axis eccentric to the axis on the drive shaft .and having sliding connections with the clutch means at opposite sides of the axis of the drive shaft whereby the eccentric oscillating element produces different increments of arcuate movement `of the drive shaft in opposite directions to advance the web a distance of one line during each oscillation, and a yielding device connected to the paper web and permitting movement thereof in one direction by the take-up reel and moving the web of paper in the opposite direction.

3. A driving mechanism for controlling the oscillation of a shaft successively in opposite directions with an increment of gain in the angular movement in one direction comprising a pair of `one-way clutches mounted on the shaft, one of said clutches controlling rotation of the shaft in one direction and the other clutch positively driving the shaft in the opposite direction, an oscillating element mounted to rock on an axis eccentric to the axis of the shaft at one side thereof, and means connecting the oscillating element and clutches comprising members projecting from one of the loscillating and clutch elements and radial shoulders :on the other element engaged by the members to transmit arcuate movement from the oscillating element t-o the clutches while permitting relative movernent radially to compensate for the eccentrieity of the oscillating element whereby `to produce a greater increment of arcuate movement of the shaft in one direction than in the other.

4. In a printer, a .cylindrical platen roll, a Web of paper looped around said platen roll, a take-up reel at one end of the loop of paper web, a supply reel at the iopposite end of the loop of paper web, a shaft connected to drive the take-up reel, a pair of one-way clutches mounted on the shaft, each of said clutches having radially extending arms with slots therein, an oscillating swing plate mounted to rock on an axis eccentric to the axis `of the drive shaft for the take-up reel and having radial arms, pins extendmg from the radial arms of the oscillating swing plate through the slots in the radial arms tof the pair of one-way clutches, respectively, driving means for oscillating the swing plate in opposite directions through equal arcs and acting through the pins to rock the radially extending arms of the separate clutches through unequal arcs, a pivotally mounted gripper between the supply reel and platen for gripping the paper, and a spring connected to the gripper to permit it to rock against the action of the spring in one direction and to move the gripper and web of paper gripped thereto in the opposite direction.

5. In a printer in accordance with claim 4 in which power operated means is connected to turn the swing plate in one direction, a spring connected to turn the swing plate in the opposite direction, and a stop controlling the move- `ment of the swing plate under the action of the spring to limit the turning movement of the take-up reel,

6. A printer in accordance with claim 5 in which the diameter of the reel increases as the paper web is wound thereon, and means operated by the increase in diameter of the reel for actuating the stop and thereby controlling the angular movement of the reel as its diameter increases to maintain a substantially constant linear movement of the paper weh in one direction.

7. A printer in accordance with claim 6 in which the stop is mounted on a shaft and extends radially in the path of one of the connecting pins projecting from the swing plate, and a feeler mechanism engaging the periphery of the take-up reel for rocking the shaft as the diameter of the reel increases.

8. A printer in accordance with claim 4 in which the swing plate has a crank pin projecting from the side opposite the connecting pins, a driving crank having a crank pin, a rod connecting the crank pins on the driving crank and swing plate, said rod having a slot therein through which the pin of the driving crank extends, a spring connected to move the rod in the opposite direction when released hy the driving crank pin, and a stop controlling the movement of the swing plate under the action of the spring to limit the turning movement of the take-up-reel.

9. A printer in accordance with claim 8 in which the driving crank releases the rod at the beginning 'of a printing operation for operation by the spring, said gripper moving said paper web to a printing station, driving means for operating said driving crank at the end of a printing operation to positively actuate the connection rod, swing plate and take-up reel.

10. A printer in accordance with claim 4 in which the pivotally mounted gripper comprises a pair of hars pivotally connected to each other intermediate the ends thereof, one of said hars being pivotally mounted adjacent one end, gripping elements projecting from one side of the hars and cooperating to grip the paper weh therebetween,

said pivotally connected bars rocking as a unit about the pivotal mounting of one of said bars, yielding means connected to at least one of said har-s for biasing the bars in one direction, and a stop for engaging the other of said bars for rocking it relative to the pivoted bar to release the paper web.

11. A printer in accordance with claim 4 in which the pivotally mounted gripper comprises a first bail pivotally mounted for rocking movement and having a crosshar over which the web of paper feeds from the supply roll to the platen roll, a second hail pivotally mounted on the first bail and having a crosshar adjacent the crosshar of the iirst bail to grip the paper therebetween, spring means connected to rock the hails in the direction opposite the direction in which the weh feeds from the supply reel, said second hail having an extending arm, and a stop engaged by the extending arm 4of the second hail to cause the hails to rock relative to each other at a predetermined time during the rocking movement -of the rst bail to release the paper web therebetween to permit the feeding of an increment of paper from the supply reel between the hails,

References Cited by the Examiner UNITED STATES PATENTS 452,085 8/1891 Sheen 74-158 1,818,338 8/1931 Kropi 10l*96 2,050,022 8/1936 Shipley 101--96 2,238,517 4/1941 Colley et al. l0l-66 3,305,000 12/1942 Goodbar 197-127 2,506,337 5/1950 Boyden lOl-94 WILLIAM B. PENN, Primary Examiner. 

1. IN A PRINTER OF THE TYPE HAVING TYPE ELEMENTS WITH A TYPE FACE FOR EACH CHAACTER TO BE PRINTED, MEANS FOR ADJUSTING THE PLURALITY OF TYPE ELEMENTS RELATIVE TO A PRINTING STATION, A PLATEN ROLL AT THE PRINTING STATION, A WEB OF PAPER LOOPED AROUND SAID PLATEN ROLL, MEANS FOR MOUNTING THE TYPE ELEMENTS AND PLATEN ROLL FOR RELATIVE MOVEMENT TO PRINT AN IMPRESSION FROM THE TYPE ELEMENTS ONTO THE WEB AND DRIVING MEANS FOR THE TYPE ELEMENT ADJUSTING MEANS AND FOR RELATIVELY MOVING THE TYPE ELEMENTS AND PLATEN ROLL IN TIMED RELATION, THE COMBINATION WITH SAID ELEMENTS OF SAID PRINTER OF AN IMPROVED PAPER FEED AND GAINER MECHANISM COMPRISING A TAKE-UP REEL CONNECTED TO ONE END OF THE LOOP OF PAPER FOR POSITIVELY MOVING IT IN ONE DIRECTION, A SPRING ACTUATED TAKE-UP MEANS CONNECTED TO THE OTHER END OF THE LOOP OF PAPER FOR MOVING IT IN THE OPPOSITE DIRECTION, A DRIVE SHAFT CONNECTED TO THE TAKE-UP REEL, A PAIR OF ONE-WAY CLUTCHES MOUNTED ON SAID SHAFT, ONE OF SAID ONE-WAY CLUTCHES BEING MOUNTED TO GRIP AND ROTATE THE SHAFT WHEN TURNED CLOCKWISE AND RELEASE THE SHAFT WHEN TURNED COUNTERCLOCKWISE, THE OTHER OF SAID CLUTCHES CONTROLLING AND LIMITING THE ROTATION OF THE SHAFT WHEN TURNED COUNTERCLOCKWISE, A MEMBER MOUNTED TO OSCILLATE ON AN AXIS ECCENTRIC TO THE AXIS OF SAID DRIVE SHAFT, AND SAID MEMBER HAVING A SLIDING CONNECTION WITH THE ONE-WAY CLUTCHES TO OSCILLATE THE CLUTCHES WHEREBY TO TURN SAID SHAFT AND WEB OF PAPER THROUGH A GREATER ARC IN ONE DIRECTION THAN IT IS MOVED IN THE OTHER DIRECTION. 